Object.getPrototypeOf(obj);  --->返回对象的隐式原型
Object.setPrototypeOf(obj, Object);

Object.create(obj); 返回一个以obj为隐式原型指的对象

如何得到没有任何属性的对象
var a = Object.create(null);

<script type="text/javascript">
	Student.prototype.learn = function () {
		console.log("studying")
	}
	function Student () {};

	function GoodStudent () {};
	GoodStudent.prototype = Object.create(Student.prototype);
	var gs = new GoodStudent();
	console.log(gs.learn());
</script>